How to use superscript with ggplot2

Question

How to print angstrom square in x axis? I tried as follows.

labs(x = "x axis" (Å^2)", y = "y axis")

Answer 1

We can use bquote

library(ggplot2) ggplot(mtcars, aes(hp, mpg)) +         geom_point() +        labs(x = bquote('x axis'~(Å^2)), y = "y axis") +        #or        #labs(x = bquote('x axis'~(ring(A)^2)), y = "y axis")         theme_bw() 

Answer 2

You should use expression, preferable combined with paste, as follow:

ggplot(mtcars, aes(hp, mpg)) + geom_point() + labs(x = expression(paste("x axis ", ring(A)^2)), y = "y axis")

Answer 3

You could just simply use:

ggplot(mtcars, aes(hp, mpg)) +  geom_point() +  labs(x = x~axis~ring(A)^2, y = "y axis")